[PATCH] ACPICA: Windows compatibility fix: same buffer/string store

[Lin Ming <ming.m.lin@intel.com>]

Hi, Len

This is the important fix for the WMI based HotKey issue reported by Dell.
Could you merge it to 2.6.31-rc8?

Thanks,
Lin Ming
---

Subject: [PATCH] ACPICA: Windows compatibility fix: same buffer/string store

Fixes a compatibility issue when the same buffer or string is
stored to itself. This has been seen in the field. Previously,
ACPICA would zero out the buffer/string. Now, the operation is
treated as a noop. ACPICA BZ 803.

http://bugzilla.acpica.org/show_bug.cgi?id=803

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
---
 drivers/acpi/acpica/exstorob.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/acpica/exstorob.c b/drivers/acpi/acpica/exstorob.c
index 67340cc..257706e 100644
--- a/drivers/acpi/acpica/exstorob.c
+++ b/drivers/acpi/acpica/exstorob.c
@@ -70,6 +70,12 @@ acpi_ex_store_buffer_to_buffer(union acpi_operand_object *source_desc,
 
 	ACPI_FUNCTION_TRACE_PTR(ex_store_buffer_to_buffer, source_desc);
 
+	/* If Source and Target are the same, just return */
+
+	if (source_desc == target_desc) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
 	/* We know that source_desc is a buffer by now */
 
 	buffer = ACPI_CAST_PTR(u8, source_desc->buffer.pointer);
@@ -161,6 +167,12 @@ acpi_ex_store_string_to_string(union acpi_operand_object *source_desc,
 
 	ACPI_FUNCTION_TRACE_PTR(ex_store_string_to_string, source_desc);
 
+	/* If Source and Target are the same, just return */
+
+	if (source_desc == target_desc) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
 	/* We know that source_desc is a string by now */
 
 	buffer = ACPI_CAST_PTR(u8, source_desc->string.pointer);